WARNING in rcu_tasks_verify_work_fn

Status: upstream: reported on 2026/03/31 21:53
Subsystems: kernel
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+251e9abcdac140e7ec74@syzkaller.appspotmail.com
First crash: 187d, last: 28m
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ID Workflow Result Correct Bug Created Started Finished Revision
f65ca737 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in rcu_tasks_verify_work_fn 2026/05/26 01:24 2026/05/26 01:24 2026/05/26 01:51 c69befb3
▶ ▼ Discussions (4)
Title Replies (including bot) Last reply
[PATCH AUTOSEL 6.18-5.10] wifi: cfg80211: validate IEs in cfg80211_wext_siwgenie() 8 (8) 2026/08/31 13:30
[PATCH] rcu-tasks: Dump rcu tasks status when the boot-test failed 1 (1) 2026/07/06 10:03
[PATCH] rcu-tasks: Fix possible boot-time tests failed for the call_rcu_tasks() 1 (1) 2026/04/23 11:19
[syzbot] [kernel?] WARNING in rcu_tasks_verify_work_fn 0 (1) 2026/03/31 21:53

Sample crash report:
call_rcu_tasks() has failed boot-time tests.
rcu_tasks: RTGS_WAIT_SCAN_HOLDOUTS(6) since 32 g:5 i:0 kCuUP l:25 
------------[ cut here ]------------
ret < 0
WARNING: kernel/rcu/tasks.h:1541 at rcu_tasks_verify_self_tests kernel/rcu/tasks.h:1541 [inline], CPU#0: kworker/0:2/190
WARNING: kernel/rcu/tasks.h:1541 at rcu_tasks_verify_work_fn+0x1b6/0x270 kernel/rcu/tasks.h:1553, CPU#0: kworker/0:2/190
Modules linked in:
CPU: 0 UID: 0 PID: 190 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: events rcu_tasks_verify_work_fn
RIP: 0010:rcu_tasks_verify_self_tests kernel/rcu/tasks.h:1541 [inline]
RIP: 0010:rcu_tasks_verify_work_fn+0x1b6/0x270 kernel/rcu/tasks.h:1553
Code: 80 3c 10 00 0f 85 b5 00 00 00 48 8b 35 9b 65 77 0c b9 64 00 00 00 bf 08 00 00 00 48 c7 c2 a0 3a 9a 9b e8 3d 5a e2 ff eb 97 90 <0f> 0b 90 eb 91 48 89 df e8 fd b4 8f 00 e9 69 ff ff ff 48 89 df e8
RSP: 0000:ffffc90002f6fbb0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffffffff8edeba28 RCX: 0000000000000000
RDX: 1ffffffff1dbd745 RSI: ffffffff81e9a009 RDI: fffff520005edf49
RBP: 1ffff920005edf76 R08: 0000000000000007 R09: 0000000000000000
R10: 8000000000000000 R11: 0000000000000001 R12: 0000000000000bb8
R13: 00000000ffffffff R14: 0000000000000001 R15: ffffffff8edeba28
FS:  0000000000000000(0000) GS:ffff888123b55000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88823ffff000 CR3: 000000000eb96000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (718):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/01 08:03 upstream 551c722f4080 38f7f0d1 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/10/01 07:03 upstream 551c722f4080 38f7f0d1 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/10/01 05:56 upstream 551c722f4080 38f7f0d1 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/30 23:25 upstream 551c722f4080 15fb8e5e .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/30 21:38 upstream 551c722f4080 15fb8e5e .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/30 20:31 upstream 551c722f4080 15fb8e5e .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/30 19:09 upstream 551c722f4080 15fb8e5e .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/30 18:01 upstream 551c722f4080 15fb8e5e .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/30 16:58 upstream 551c722f4080 15fb8e5e .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/30 14:14 upstream 551c722f4080 892a21ec .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/30 13:07 upstream 551c722f4080 892a21ec .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/30 08:54 upstream 6f8319e3e9a4 7808aef4 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/30 07:37 upstream 551c722f4080 7808aef4 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/30 06:22 upstream 551c722f4080 7808aef4 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/30 03:28 upstream 6f8319e3e9a4 328436b3 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/30 02:23 upstream 6f8319e3e9a4 328436b3 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/29 23:11 upstream 6f8319e3e9a4 7808aef4 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/29 21:44 upstream 6f8319e3e9a4 7808aef4 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/29 20:39 upstream 6f8319e3e9a4 328436b3 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/29 18:58 upstream 6f8319e3e9a4 7bf4ea23 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/29 16:07 upstream 6f8319e3e9a4 7bf4ea23 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/29 14:27 upstream 72d3fcf802c4 7bf4ea23 .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/29 13:48 upstream 72d3fcf802c4 7bf4ea23 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/29 11:13 upstream 72d3fcf802c4 7bf4ea23 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/29 09:27 upstream 72d3fcf802c4 7bf4ea23 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/29 06:09 upstream 72d3fcf802c4 7bf4ea23 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/29 04:13 upstream 72d3fcf802c4 58f15308 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/29 03:13 upstream 72d3fcf802c4 58f15308 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/29 00:11 upstream 72d3fcf802c4 58f15308 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/28 22:57 upstream 72d3fcf802c4 58f15308 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/28 20:49 upstream 72d3fcf802c4 58f15308 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/28 19:30 upstream 72d3fcf802c4 58f15308 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/28 18:28 upstream 72d3fcf802c4 58f15308 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/28 17:05 upstream 72d3fcf802c4 58f15308 .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/28 15:16 upstream 72d3fcf802c4 a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/28 10:14 upstream 72d3fcf802c4 a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/28 08:55 upstream 72d3fcf802c4 a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/28 07:47 upstream d266640c6c76 a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/28 06:39 upstream efb44d93a620 a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/28 03:38 upstream d266640c6c76 a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/27 23:38 upstream d266640c6c76 a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/27 21:37 upstream efb44d93a620 a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/27 18:38 upstream efb44d93a620 a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/27 13:35 upstream fd179f8a05be a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/27 10:06 upstream fd179f8a05be a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/26 21:26 upstream 6812ce4e4379 a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/09/26 18:34 upstream 6812ce4e4379 a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/26 16:54 upstream 6812ce4e4379 a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto WARNING in rcu_tasks_verify_work_fn
2026/09/26 12:46 upstream 6812ce4e4379 a3c7249d .config console log report [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root WARNING in rcu_tasks_verify_work_fn
2026/06/25 12:48 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next 319fafd9a374 432fd51a .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-riscv64 WARNING in rcu_tasks_verify_work_fn
2026/04/27 05:43 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next 9b3a2be84803 9c2d0995 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-riscv64 WARNING in rcu_tasks_verify_work_fn
2026/03/27 22:12 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next b335bc5892a0 158c21af .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-riscv64 WARNING in rcu_tasks_verify_work_fn
2026/03/27 21:42 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next b335bc5892a0 158c21af .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-riscv64 WARNING in rcu_tasks_verify_work_fn
* Struck through repros no longer work on HEAD.